Dressing tool



April 2.4, 1928.

J. S. DONALDSON DRESSING TOOL ATroRNEY Patentedy pr. 24, 1928.

hanSSING TOOL.

lippiieafiun fiie'awiio'vember 21, 1924) sriaiNm 751,233.

This invention `relates` to' dressingr tools of,

the liinjd used 'for dressing and trning abrasive Wheels having a rotatably mounted dressing` Wheel Carried at one end' of a ,shank theother end of which is provided with or for-ined to serve as a handle when the tool is to be usedV as athand tool. vThe dressing wheelsfused if'n such hand dressingv tools are eolnn'ionly ina'd'e with V-notehed or multi'- p'oiiited peripli'eri'es and become more or less I rapidly Worn d'ovvnin. use and Vhave to be vrenewed yfrein time to time.' It is necessary,

therefor@ that the toolsbe made so a's Ato perm-it of removal of--Worn wlieelsra'nd substitiition of nevv Wheels; In ythe tools heretofo're needy this" replacement of the dressing Wheels' has been' a botl'iers'oiiie operation, talking considerable time, andl to providefor such renevval the tools have 'been made with laterally projecting parts which interfere xvi-th tlie'use oit the'V tool in Quitting el'o'se in to corners" on the'abrasive vvheel which is" -being shaped'. Diiiienlty in the use of' such tools heretoforel'i'as e'sultecl, also', from the `Wearing may 0i the axle .pins o Jche dressing Wheels and' ott the bearings' for suoh pins', resulting .in the dressing' wheels getting' `out of trite ingy a Coinpaiatii'vely shfoit peiodof use. V f

The' present*inventionv a'ims generally to providev an inipioved han'dI d'ressii'ig tool". lv'ore,,paitieiilaiilyz Y the invention aiins to provide al tool in Xvli-i'eli the dess'in'g Wheels after beizoniing worn' niay'be reinoved and new ,ones set in place with comparative-ease and' speedV and Xvitlioutreqiiiiing the use of a Wrench or other toolg'to a'void la'teralf'projeetions on theI tool and' thiis to enable' thetool to be riseilelosei iii eoiiners ol the Woi'li; andl to provide av innntiiigfoi the L lieesingy wheel siieh that the Wheel shall always run true on a true bearing andV wvitliout the frietion which results from Worn and' uneven bearings. Other objeets' and"advantages ot thel invention will appear from' the followiw"v deseiiption of aytool of approvedeonstruet'ion einbodyin'gthe features thev invention as illustratedv inl the accompanying drawings. InY said drawings y Figli is aside View ofthe tool; y y

2 is a top'l plan view of the headv end of thetoolgf gf. 3 is a: sid-e view of the head end of tlie'tool' Shoivingl the side plates and dress*-` ing" vvheel slid .foivvard :to the position in whichv the side plates areavplied to or e v moved from the end olf the. Shank, tlreoovei of the side plate which is'fseen being removed andxthe'y bolt for holding the side plates ,andthe rivets for holding` the cover plate being shown in section.;

'-Le otFig. l;

.Frig. 5' isa seetionalview on line '5-5 d Fig. l'.

Referring. to th'edraavings, vthe tool .coinprises a shank l()4 formed as a handle 1l at one `endv and Carryingatits other, or head', endg. tvo reniova'ble `side plates 12andj13; the vends of 4which eXte'n'd beyond' the en'ds of the shank and' have inoiinted between then] the dressing Wheel let-.5 The head end of .the

shank is formed on". opposite sides .with Haft bearingaeesV 15' against xwh'i'ehi the side5 or carrier, plateslQ aindlS .are seated. The

.teii'ds tlrongl1-a1i opening. l.near lthe vend off the vshank and' .throughlongitudinal slots .17 inthe 'sideplatesfanil has on each' end a flat'perinanent head'.18' which' extends over the edges* of the sltA to`r hold the plate. Means' arexprovided for preventing the side plates fromturning on .the bolt 16 While held aGainst the bearing ae'eslof t/lieshank.

Most esirably fr .this per-pese the Shank is'oiined on2 each sideWith laterally extending upper and' lower portions or flanges' 20 a'x'ld' which provide'shoulders along the Yedges of the bearing faces lhai'xfd rthe side plates are made'y olla' Wi'djth tol fit' between these' shoulders. The plates are tlil'isheld against turning, but unless othervvf e held may Ii'ioved'longitridinally as pt 'i'tted by thes'lots 1'7. The'inner ends'ot tlji slots are eililarged' to permit the side plates to be renioved 'li'oni'the shank Whenthey have ybeen'1noved'-forward from theii` normaal position to the position' shown in 8, the

e1ilargementl at' the end ot theslot being ot snllicient size to peiniit the bolt heads to vpass.' y v The ends' of the bolt IGf serve as headed stads for holding ilhesi'fl plat'stthe s'lianli head", Vbut a reiiiova'ble boltfis ,need for con.- veni'enoe; and tov l'qe'iniitl the pei'iiiahently headed bolt-td be plaCeCl: iii theA bolt Opening in the shank, the ybolt opening is made, showin i'n Figi open at thel top. For holdiiigflthe sidepltes in noi-'malv or operative vided 'eailiid" by a' flat' spring andV posi'- l 3 from a point suiiiciently above the posi-` tion of the bolt.

The outer end of each side plate carries an anti-friction bearing for one end of the `axle pin 26 on which the dressing Wheel is mounted. These bearings are best made to be bodily removable, having as shown an outer race which tits in a recess 27 extending inward from the outer side of the side plate and an inner race which has a central opening to receive the .end ot the axle pin. The

axle pin 2G has a central portion 28 and reduced end portions. A bushing 29 is kdesirably mounted on the. central portion 28 of the axle pin, and the dressing wheel is mounted on the bushing, the wheel, the bushing and the axle pin being free to turn relatively to each other. The bushing 29 and the enlarged central portion 28 of the axle pin 'desirably extend into the openings in the side plates. A thin. removable cover plate is secured on each side plate. The cover plates are formed with slots coinciding with the slots 17 of the side plates so that itis not necessary to remove the cover plates in removing and replacing the side plates.

The cover plates need to be removed only to permit removal of the anti-friction bearings and they are therefore most desirably secured by small rivets 81 rather than by screws. So held, the cover plates may be readily removed by cutting oli' the heads of the rivets and readily re-riveted in place again. If the plates were held by screws there would be danger oli' the screws becoming loosened by the Vibration incident to the use ot' the tool.

Any suitable dressing wheels may be used. Usually what are known Huntington dressers are used, these being thin disks ot very hard tempered steel and peripherally notched to lorm a multiplicity oit V-shaped teeth. Two or more of these disks are usually placed tlatwise together separat-ed by washers ot' hard tempered steel oi' a size to extend out to the points of the disk teeth. The drawings show a thin dressing wheel made up of two disks separated by a washer. For wider, or thicker, wheels the flat-sided head end of th-e tool shank 10 is made thicker and a longer axle pin 26, a longer bushing 29 and a longer holding bolt 16 are used. For wheels ot' differing thickness, there'lore, the saine side plates with their anti-'friction bearings may be used with a shank having its fiat-sided head end ot the proper thickness to suitably space the side plates to receive the wheel, and with a holding bolt, axle pin and bushing of the proper corresponding length.

It is desirable to make the side plates so that they may be endwise reversible, that is, so that they may be secured to the shanky with either end extending outward beyond the end ot the shank. For this purpose each side plate is made, as shown, with each end the duplicate of the other, having a similarly placed opening for the axle pin and bushing and similarly recessed from its outer side tor receiving the. anti-friction bearing,

taken out and set in the other end ot the plate, and the plate replaced with its unl damaged end outward. The'side plates are also duplicates ot eachother, the plates ot' a tool or ol different tools olf the-same size being thus interchangeable.

When it is desired to replace a worn dressing wheel with a new wheel, the stop bar or latch 22 is raised as shown in Fig. 3 and the side plates thus released are pulled forward to the position shown in Fig. 3 and one, y

or both, it desired, is then removed from the shank head, the bearing pin slipping readily out trom one or both of the antifrictionbearings. The worn wheel is then removed and a new one set in position, and

the side plates are then returned to the position shown in Fig. 3 and then pushed inward on the shank head until the stop 22 snaps down into the notch Q4. The tool is then ready tor use.

It is to be understood 'that the invention is not to be lin'iited 'to thek exact construction shown and to which the foregoing description has been largely confined, but that it includes changes and niodiications within the claims, and that features ot the invention may be employed indepr-indently ot other tentures thereof.

lli/That is claimed is:

l. Av dressing tool, comprising a shank, two removable side plates held against opposite sides of the shank with theirends extending beyond the end ot the shank by a headed stud extending from the shank through a longitudinal slot in each side plate, a dressing wheel mounted between the extending ends ot the side plates, and hold- ,ing means for normally holding the side plates against longitudinal movementl from their normal position on the shank, the side plates being movable longitudinally for rellt) rio

fio

headed stud extending'rOm the shank through' a longitudinali.lslotfin .each-side plate," a dressing wheel mounted-:between the 'extending ends' of the side plates, the side plates being reversible endwiseand'the slots in the plates fbe'ing 'located midway .between the ends thereof andi beingenlarged at each end to permit removal ot-vthe plates'when moved Vforward Itroiii their `I i'ormal .position yon the shank, and means ior normallyhold-r ing' the 'plates againstlongitudinal m'ove. .nient from their normal position on4 the shank. 'I i f' lressilngf tool, A: comprising a shank, two removable side plates held against opposite sides ot' the shank with. their ends extending beyond ,.t-heend ot theshank `bya headed stud extending from the shank through" 'a' loi'igitudinfal slot-1n leach side plate, the side plates being reversible enclwise and the slots in the platesbeing located midway between the ends thereof yand being enlarged at each end to permit removal of.

the platesL when moved forward from their position on the shank and the plates having a recess in each end 'for receiving an antitriction bearing, an anti-friction bearing removably set in the recess in the extending end of each plate, an axle pin, the ends of which are supported by the said anti-friction bearings, a dressing wheel mounted on said axle pin between the extending ends of the side plates, and means for normally holding the plates against longitudinal movement from their normal'position on the shank.

A. A dressing tool, comprising a shank, two removable side plates secured to opposite sides ot the shank with their ends extending beyond the end ot' the shank, means Jfor holding` the side plates against the sides oi` the shank formed to permit the plates to be removed when moved longitudinally from their normal position, means for normally holding the side plates against longitudinal movement from their normal position on the shank, the side plates being reversible vendwise and having a recess in each end for an anti-friction bearing, an anti-friction bear-k ing removably set in the recess in the extending` end of each plate, and a dressing wheel mounted between the extending ends of the side plates with the ends ot its axle supported by said bearings.

5. A dressing tool, comprising a shank, two side plates removably secured to opposite sides ot the shank with their ends ex`A tending beyond the end of the shank, an anti-friction bearing set in a recess in the outer 'side of the extending end of each side plate, an axle pin `nioimtd in said bearings having' an enlarged :central .portion .the "ends of which :form shoulders adapted ,to bear against the -innerrace oi' .thebearings to. pre'- .vent endwise ldisplacement ofthe axlepin, a

Lbushing tree to rotateon the axle pin bei tween the bearings, the I bushing-,being 0i' approximately the same length as theenlargedv 'central portion of .the ,axle pin'` andthe ends ot the bushing extending into fthe-axle pin openings 1n the side plates-and a dressing wheel mounted :free .tov rotate `on said bush'- .ing.

6. A dress-ing toojl, comprising ashank havingat its headend-parallelbearing t ces on opposite sidesnthereo, tworemovable sidey plates set one against feaehotsaid bearing v`"iiaces and exten-ding beyond-the endirogthe ,shank and vlieldiby ,a bolt extending through [longitudinal slots `in lthe s idc plates and hav- ".ng @fixed liet head en geallelld, ,lifliisafef :holding .the ,Sdefpletes in. Misilmeri@ ,the

slots inthe side plates'jhavingenlarged inner Vends .to 4vpermit removal lo, ,the

when moved forward from their normal position on the shank, means `for normally holding the plates against longitudinal movement from their normal position on the shank, an anti-friction bearing set in the extending end of each side plate, an axle pin mounted .in said bearings having an enlarged central portion the ends of which form shoulders adapted to bear against the inner race of the bearings to prevent end- I yWise displacement of the axle pin, and a dressing wheel mounted on the axle pin between the extending ends of the side plates.

7. A dressing tool, comprising a lshank,

having at its headv end parallel bearing faces on opposite sides thereof and parallel shoulders at the longitudinal edges of said faces, two removable side plates set one against each ot said bearing faces between said shoulders and extendingbeyond the end of the shank and'heldby a headed stud extending through a longitudinal slot ineach' llt) side plate, the slots in the side plates having l enlarged inner ends to permitl removal of' the Aplates when moved forward from. their normal position on the shank, a spring latch for engaging notches in the edges ot the side plates to hold theplates against longitudinal movement from their normal position on the shank', a dressing wheel mounted be- -tween the extending ends of the side plates,

an axle pin on which said wheel is mounted tree to turn, and removable bearings in said side plates for the ends of said axle pin.

, 8. A dressing tool, comprising a shank having at its head end parallel bearing faces on opposite sides thereof, two removable side plates set one against each of said bearing faces and extending beyond the end ot' the shank and held by a headed stud extending through a longitudinal slot in each side `plates against longitudinal movement from their normal position on the shank, the side plates being reversible endwise andthe slots in the plates being located midway between the ends thereof and being enlarged at each end to permit removal of the plates when moved forward from their normal position on the shank, and the plates, having a recess in each end for receiving an anti-friction bearing, an anti-friction bearing set in the recess in the extending end of each plate, an axle pin, the ends of which are supported by said antifriction bearings, and a dressing wheel mounted between the extending ends of the plates on said axle pin.

9. A dressingtool, comprising a shank having at its head end parallel bearing faces on opposite sides thereof and parallel shoulders at the longitudinal edges of .said faces, two removable side plates set one against each of said bearing faces between said shoulders and 'extending beyond the end .of the shank and held by av bolt setin a the ends thereof and being enlargedat each end to permit removal of the plates when moved forward from their normal positions on the shank and the plates having an outside recess in each end for receiving an antifriction bearing, an anti-friction bearing set inthe recessvin the extending `end ofeach plate, an axle pin', the ends of which are supported by said bearings, a dressing wheel mounted between the extending ends of the side plates on said-axle, anda detachable cover plate on the outer side of each side plate. I

In testimony whereof I have hereunto set my hand.

JOHN SHEARMAN DONALDSON. 

